Dear, I have a network with 5 ptp. All made with SXT. 5 on one side, BASE, and 5 on the other side, CLIENT. This I have in a rented building, so I find difficult to access. My question is. Is there any way to access remotely the SXT? Without having a public IP for each SXT? Before, the SXT came the ability to connect using DynDNS, but now with new firmware updates is no possible. Anyone have any recommendations. thanks

So, your problem is because the public ip address always change on those machine?
You can try to set up pptp client on those sxt, dial out to your other mikrotik router somewhere else.
Make sure the router have permanent public ip address.

If you want to access the sxt, you can login to the router first, and then to sxt.